Zazzle was definitely one of the most challenging places I had interviewed at. Arriving at the location. I was surprised at how large the building was. I had previously expected only a small office space since I heard it was a budding startup. I agree with the other reviewer that the place was rather disorganized and the construction going on was quite distracting. However, I think that it is perfectly reasonable since they are undergoing an office renovation, and the employees have no control over it. I was assured that the building would look awesome by the summer. Everyone that I talked to at Zazzle was incredibly brilliant. I have been to 40+ software engineering interviews over the past 2 months, and this was by far the most challenging process I had to go through. I went through 5 interviewers back to back, each for around 45mins to 1hour. I was there for a total of 5hours 30mins. All the questions they asked ranged from moderately challenging to very challenging. I think the nature and difficulty of questions they posted to me made me even more excited about joining the company. Many software engineers at the company are Stanford & MIT computer scientists, many with postgraduate degrees, and some even have phds. They were all very friendly to me, and I loved the atmosphere there.